Workshop Technology
In a four high rolling mill, there are four rolls out of which

Three are working rolls and one is backing up roll
One is working roll and three are backing up rolls
All of the four are working rolls
Two are working rolls and two are backing up rolls

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Workshop Technology
Spot welding is used for welding

Butt joints in plates having 0.025 mm to 1.25 mm thickness
Lap joints in plates having 0.025 mm to 1.25 mm thickness
Butt joints in plates having thickness above 3 mm
Lap joints in plates having thickness above 3 mm

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